A Guide to Replacing Suspension Strut Assemblies on a 2015-2022 Mazda 3
Restore your Mazda 3's ride and handling by understanding your strut replacement options.
- Always replace struts in pairs (both front or both rear) and get a wheel alignment afterward.
- For best results matching the original ride, KYB is the most recommended aftermarket brand for the Mazda 3.
- Buying a complete 'quick strut' assembly makes the job much easier and safer than compressing springs.
- Listen for clunking or rattling noises, as they may be related to known TSBs for strut bearings or mounting hardware.
Signs of a Failing Strut Assembly
When your Mazda 3's struts start to wear out, you'll likely notice a change in how it drives. These parts typically need attention every 50,000 miles or so, but this can change based on your driving habits and road conditions. Here are the common symptoms to watch for:
- Bouncy or Rough Ride: The car feels unstable and bounces multiple times after hitting a bump.
- Nose-Diving and Body Roll: The front of the car dips down hard when you brake, or the car leans excessively in corners.
- Noises Over Bumps: You hear clunking, knocking, or rattling sounds from the suspension area when driving on uneven surfaces.
- Uneven Tire Wear: Worn struts can cause the inside or outside edges of your tires to wear down faster than normal.
- Visible Leaks: You might see fluid leaking from the strut body itself.
Known Issues, TSBs, and Recalls
While the 2015-2022 Mazda 3 is generally reliable, a few suspension-related Technical Service Bulletins (TSBs) have been issued. These are not safety recalls but are instructions for dealers to fix specific, known problems.
- TSB 02-003/15: Addresses a knocking or squeaking noise from the front strut bearing when turning the wheel or driving on rough roads. This could be due to a damaged bearing or stick/slip between the bearing and the coil spring.
- TSB 02-004/21 & 02-003/24: These bulletins address a rattling or banging noise from the front suspension over bumps. The cause can be related to insufficient clearance in a mounting rubber or rusting subframe bolts. Some owners have noted the fix for the lower arm bushing could slightly increase road noise.
Pro Tip: No major safety recalls have been issued specifically for the struts on the 2015-2022 Mazda 3 in the US market. Searches for recalls often show issues for other models or different components like airbags or brake calipers.
Choosing the Right Aftermarket Strut Assembly
When replacing your struts, you'll choose between Original Equipment (OEM) and aftermarket parts. For the Mazda 3, high-quality aftermarket parts can offer similar or even better performance than stock. A complete strut assembly (or "quick strut") is highly recommended. It includes the strut, spring, and mount all in one unit, which makes installation much easier and safer.
🎬 See this step-by-step walkthrough for replacing front strut assemblies.Brand Tiers for Your Mazda 3
Based on owner feedback and mechanic consensus, aftermarket brands fall into different quality tiers.
Tier 1: OEM Quality or Better
- KYB: This is a highly recommended brand for the Mazda 3. Many consider KYB to be an OEM supplier, meaning they make the original parts for many car manufacturers. Owners report that KYB struts, like the Excel-G series, restore the original "zoom-zoom" feel and are a durable, high-quality option.
Tier 2: Good Value Aftermarket
- Monroe: A well-known brand that offers a decent replacement. Some users feel their quality has declined recently, and they may provide a softer, less responsive ride compared to KYB or the original OEM struts. However, they are a widely available and generally acceptable option.
Tier 3: Economy/Budget
- FCS Struts: These are a budget-friendly option. While they will function, they are generally considered a lower-tier choice. Forum discussions suggest they may not have the same ride quality or longevity as KYB or Monroe, and some owners have had negative experiences with them. They might be suitable for an older, high-mileage vehicle you don't plan on keeping for long.
Cost to Replace Mazda 3 Strut Assemblies
The cost can vary based on the parts you choose and whether you do the work yourself or hire a professional. Remember to always replace struts in pairs (both front or both rear) to ensure even handling and performance. A wheel alignment is also highly recommended after replacement.
| Item | Estimated Cost |
|---|---|
| New Aftermarket Assembly (per pair) | $217 - $452 |
| New OEM Strut (part only, per pair) | $500 - $550 |
| Shop Labor (per pair) | $237 - $348 |
| Total Professional Replacement (Aftermarket) | $454 - $800 |
Frequently Asked Questions (FAQ)
Do I need to replace all four struts at once?
No, but you must replace them in pairs. If the left front strut is bad, you must replace the right front as well. The same goes for the rear. This ensures the car is balanced and handles predictably.
Is a wheel alignment necessary after replacing struts?
Yes, it is highly recommended. Replacing the front struts will almost always affect your vehicle's alignment settings. Skipping this step can lead to poor handling and premature tire wear.
Can I use the struts from a different Mazda 3 generation?
No. You must use parts specifically designed for the 2015-2022 model years (3rd generation). Suspension components are engineered for the specific weight, handling characteristics, and mounting points of a particular vehicle generation.
What's the difference between a strut and a shock absorber?
A strut is a structural part of the suspension that includes a shock absorber within its assembly. A shock absorber is just a damping device and is not a structural component. Your 2015-2022 Mazda 3 uses struts in the front and traditional shock absorbers in the rear.
🎬 Watch: How to replace the rear shock absorbers yourself.Helpful Videos
Technical Specifications
The 2015-2022 Mazda 3 uses a MacPherson strut front suspension and a multi-link rear suspension with separate shock absorbers and coil springs. Aftermarket parts are available as complete assemblies for the front.
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The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
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